Engineered to deliver the performance attributes most requested by on - and off-track dirt bike riders, including consistent clutch feel. Consistent clutch feel is the result of 'friction durability', so whether deep into a race or deep in the woods, riders can feel confident that their clutch will perform from start to finish. AMSOIL exclusive advanced chemistry provides outstanding engine reliability for worry-free operation under severe conditions.

Product Description
AMSOIL INC., the premier manufacturer of synthetic motorcycle lubricants, focuses on improving lubricant performance so riders can focus on improving their performance on the trail or the track. That's why AMSOIL is the Official Oil of Monster Energy Supercross, AMSOIL Arenacross, AMSOIL GNCC and the AMA Amateur Nationals.

The clutch plates lubricated with AMSOIL Synthetic Dirt Bike Oil remained clean and in good overall condition, while the plates using the OEM oil revealed discoloration and wear. AMSOIL Synthetic Dirt Bike Oil’s superior performance helps instill in riders the confidence that their bikes will perform consistently in all types of riding conditions.

Protects Against Wear
AMSOIL Synthetic Dirt Bike Oil withstands high-rpm operation, extreme heat and mechanical shear. Its synthetic base oils naturally resist viscosity loss and provide a protective film against wear to gears, bearings and pistons. Its anti-wear additives provide an extra measure of protection, promoting long component life to help riders get the most out of their bikes.

Did this product meet your expectations?

Smooth operator

This made the clutch in my Gas Gas TXT 280 Trials bike operate with better control.

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

January 17th, 2018 at 11:11 am

Reviewed by El Cora:

I would buy this product again and again

Use this oil in dirt/racing bikes. Have been using this oil for the last 5 years in all of our bikes. This product helps the performance of the bikes and would use no other.

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

January 13th, 2018 at 7:27 am

Reviewed by Chamo:

I like this product

I use in my dirt bike, excellent!!

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

January 12th, 2018 at 12:23 pm

Reviewed by Ray:

Simply the best!!

I will only run Amsoil in my dirt bike. I change the oil in my 4 stroke 250cc engine every 8 hours. I have over 250 hard woods hours on that engine....and it is still going strong!!!

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

December 11th, 2017 at 10:55 am

Reviewed by FMB:

I will buy this product every time.

I use it in my honda 450x and the clutch feel is real.Amsoil said it helps your clutch and they aren't lying.

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

December 5th, 2017 at 9:48 am

Reviewed by BC:

I will continue to buy Amsoil for my machines.

Amsoil dirt is exceptional in my Honda. Clutch works great and my motor stays clean!!

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

November 27th, 2017 at 11:42 am

Reviewed by johnny:

amsoil is the most trusted

never disappointed use it in everything

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

November 1st, 2017 at 6:16 pm

Reviewed by Charlie TUNA:

Repeat on buying this oil!!

Grandson races his bike. And this oil seems to help and last longer!!

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

October 27th, 2017 at 2:16 am

Reviewed by Dirtbike dude:

Great product

Product allows us to run more hours on our KTM's before engine overhaul. Great product!

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

October 8th, 2017 at 6:18 am

Reviewed by Dan:

I use Amsoil

I have a lot of engines in different kinds of equipment and vehicles. I use Amsoil in everyone of them except my airplanes. Have been using Amsoil for over 30 years. If I live long enough I will use it 30 more. Great oil and great customer service.

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

September 30th, 2017 at 1:46 pm

Reviewed by Jonny O:

Great product!!

Best oil around!!

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

September 1st, 2017 at 9:29 am

Reviewed by Enduro:

Good results

I switched my transmission oil after I was experiencing some clutch drag from my motorcycle once I switched the clutch drag issues were gone great product

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

August 29th, 2017 at 5:13 pm

Reviewed by Srt:

Top notch

I use this in all of our dirt bikes and atv's. Nothing but smooth running, shifting. The best.

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

July 5th, 2017 at 1:59 am

Reviewed by pro4100:

Only Oil for me

I dont need to say anything. I am an Amsoil for life customer. Enough said!

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

June 23rd, 2017 at 3:29 am

Reviewed by Gc131:

Great price and great product

I use this in my 2015 crf450 in both case sides. Works great in the engine and on the clutch side.

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

June 14th, 2017 at 12:00 pm

Reviewed by Weasel 247:

Great product!

I used this in my 2007 CRF250R and now it the only oil I used since the first oil change on my 2016 CRF250R and sons 2017 YZ125

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

June 8th, 2017 at 4:28 pm

Reviewed by Jay:

I have ran this oil since i started riding/racing

This is by far the best oil i have ever ran in my bike. I have ran synthetic mobil 1 before this and the bike just didnt run as good when i put mobil 1 in there. Amsoil changed that. Thank you Amsoil!

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

May 19th, 2017 at 3:34 am

Reviewed by Stanfill25:

I will buy this again

I use this on my Dirt Bike and use amsoil on every motor I own

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

May 19th, 2017 at 2:19 am

Reviewed by Big G:

Quality lubricant

I've been riding,racing and maintaining dirt bikes and other motorcycles for over 40 years I have been using Amsoil in all my trucks and motorcycles for around ten years. I have never had a engine failure since moving to Amsoil from Pensoil I have a 2015 Suzuki rmz 250 that I trail ride and my son rides motocross on. I change the oil and filter every 6 hrs per manufacturer recommendations. No problems at all.

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

May 17th, 2017 at 12:27 pm

Reviewed by Rustdoc:

Improved performance

I use this in the kids dirt bikes and side by side. The performance has been enhanced tremendously.

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

April 25th, 2017 at 4:39 am

Reviewed by Ebear546:

Lifetime user

Great product. Oil still looks good after 2-3 times longer change intervals in my KTM.

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

April 14th, 2017 at 4:53 pm

Reviewed by Tool Box:

Great Product I would recommend it to anyone

I have been using Amsoil for years during my GNCC off road race seasons without an oil related failure. This year I'm running 10w 40w oil designed for dirt bikes. Four races into the season and no problems and clutch wear has been minimal. VEry good product

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

April 11th, 2017 at 6:20 am

Reviewed by Barry:

10W40

Used in my son's KX 85. Great product with maximum protection while delivering incredible performance.

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

January 19th, 2017 at 1:44 pm

Reviewed by Lance:

Definitely will continue to use Amsoil products.

Since changing to Amsoil my 2016 KLR 650 idles, runs quieter and much more smooth. It shifts more precisely and smoother. I noticed the idle RPM increased slightly. I am very pleased with the results.

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

December 26th, 2016 at 10:54 am

Reviewed by ANDREA:

Great Product!!

We run this product in our dirt bikes and have had nothing but Great results!! As always Amsoil Rocks!!

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

December 26th, 2016 at 10:34 am

Reviewed by Tracy:

10W-40 Synthetic Dirt bike oil is all i run

I use this in my 2009 WR450F it is a great oil.

Item Reviewed: Synthetic SAE 10W-40 Dirt Bike Oil (DB40)

December 20th, 2016 at 1:16 am

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